package chapter04.example15;
class Animal{
    public void shout(){
        System.out.println("喵喵喵....");
    }
}
class Dog extends Animal{
    public void shout(){
        System.out.println("汪汪汪.....");
    }
    public void eat(){
        System.out.println("吃骨头.....");
    }
}
public class example15 {
    public static void main(String[] args) {
        Dog dog = new Dog();
        Animal a1=dog;
        a1.shout();
    }
}
